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Advancing Polycyclic Aromatic Hydrocarbon Bioremediation Using Genetic Bioaugmentation in Soil Microbial Communities
Advancing Polycyclic Aromatic Hydrocarbon Bioremediation Using Genetic Bioaugmentation in ...
Advancing Polycyclic Aromatic Hydrocarbon Bioremediation Using Genetic Bioaugmentation in Soil Microbial Communities

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105205
ISBN  
9798290948041
DDC  
576
저자명  
Crosby, Tessa Marie.
서명/저자  
Advancing Polycyclic Aromatic Hydrocarbon Bioremediation Using Genetic Bioaugmentation in Soil Microbial Communities
발행사항  
[Sl] : Rice University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
120 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Stadler, Lauren.
학위논문주기  
Thesis (Ph.D.)--Rice University, 2025.
초록/해제  
요약Polycyclic aromatic hydrocarbons (PAHs) are introduced into the environment through forest fires, fossil fuel combustion, and crude oil spills, posing significant health and ecological risks. These compounds are carcinogenic and disrupt soil microbial processes essential for ecosystem functions. Bioremediation, which uses microorganisms to degrade pollutants, can be applied to ameliorate contaminated environments. However, biodegradative functions are often limited because exogenous bacteria cannot compete with native microbes.Genetic bioaugmentation offers a promising solution by equipping native microbes with biodegradative capabilities encoded and delivered via mobile genetic elements such as plasmids. This approach leverages the adaptability and ecology of native microbial communities. I hypothesize that delivering catabolic genes on plasmids to native microbes enhances PAH removal by engaging a diverse, well-adapted bacterial community rather than relying on a single species. Previous research on genetic bioaugmentation has inadequately addressed the fitness impacts of plasmids on recipient bacteria, the range of plasmid recipients, and their effect on biodegradation rates.This thesis investigates these factors by engineering plasmids with the bphC dioxygenase gene and conjugating them to soil bacteria. Results revealed that plasmid fitness effects significantly influenced conjugation rates, community structure, and PAH biotransformation. Moreover, plasmid transfer rates were strongly associated with recipient bacterial abundance in synthetic communities. To track plasmid persistence, the pKJK5 plasmid was modified with a genetic memory biosensor. This plasmid persisted in soil microbial communities for 10 days without selective pressure and showed enhanced stability and biodegradation efficiency in the presence of a model PAH.These findings highlight the critical role of plasmid fitness effects in shaping microbial community dynamics and biodegradation efficiency. By addressing the activity and longevity of biodegradative functions at the community level, this research advances the design of effective genetic bioaugmentation strategies for PAH-contaminated environments.
일반주제명  
Microbiology
일반주제명  
Environmental engineering
일반주제명  
Genetics
키워드  
Genetic bioaugmentation
키워드  
Conjugation
키워드  
Polycyclic aromatic hydrocarbons
키워드  
Bioremediation
키워드  
Dioxygenase
기타저자  
Rice University Civil and Environmental Engineering
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■020    ▼a9798290948041
■035    ▼a(MiAaPQ)AAI32260774
■035    ▼a(MiAaPQ)0187rice5476Crosby
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a576
■1001  ▼aCrosby,  Tessa  Marie.
■24510▼aAdvancing  Polycyclic  Aromatic  Hydrocarbon  Bioremediation  Using  Genetic  Bioaugmentation  in  Soil  Microbial  Communities
■260    ▼a[Sl]▼bRice  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a120  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Stadler,  Lauren.
■5021  ▼aThesis  (Ph.D.)--Rice  University,  2025.
■520    ▼aPolycyclic  aromatic  hydrocarbons  (PAHs)  are  introduced  into  the  environment  through  forest  fires,  fossil  fuel  combustion,  and  crude  oil  spills,  posing  significant  health  and  ecological  risks.  These  compounds  are  carcinogenic  and  disrupt  soil  microbial  processes  essential  for  ecosystem  functions.  Bioremediation,  which  uses  microorganisms  to  degrade  pollutants,  can  be  applied  to  ameliorate  contaminated  environments.  However,  biodegradative  functions  are  often  limited  because  exogenous  bacteria  cannot  compete  with  native  microbes.Genetic  bioaugmentation  offers  a  promising  solution  by  equipping  native  microbes  with  biodegradative  capabilities  encoded  and  delivered  via  mobile  genetic  elements  such  as  plasmids.  This  approach  leverages  the  adaptability  and  ecology  of  native  microbial  communities.  I  hypothesize  that  delivering  catabolic  genes  on  plasmids  to  native  microbes  enhances  PAH  removal  by  engaging  a  diverse,  well-adapted  bacterial  community  rather  than  relying  on  a  single  species.  Previous  research  on  genetic  bioaugmentation  has  inadequately  addressed  the  fitness  impacts  of  plasmids  on  recipient  bacteria,  the  range  of  plasmid  recipients,  and  their  effect  on  biodegradation  rates.This  thesis  investigates  these  factors  by  engineering  plasmids  with  the  bphC  dioxygenase  gene  and  conjugating  them  to  soil  bacteria.  Results  revealed  that  plasmid  fitness  effects  significantly  influenced  conjugation  rates,  community  structure,  and  PAH  biotransformation.  Moreover,  plasmid  transfer  rates  were  strongly  associated  with  recipient  bacterial  abundance  in  synthetic  communities.  To  track  plasmid  persistence,  the  pKJK5  plasmid  was  modified  with  a  genetic  memory  biosensor.  This  plasmid  persisted  in  soil  microbial  communities  for  10  days  without  selective  pressure  and  showed  enhanced  stability  and  biodegradation  efficiency  in  the  presence  of  a  model  PAH.These  findings  highlight  the  critical  role  of  plasmid  fitness  effects  in  shaping  microbial  community  dynamics  and  biodegradation  efficiency.  By  addressing  the  activity  and  longevity  of  biodegradative  functions  at  the  community  level,  this  research  advances  the  design  of  effective  genetic  bioaugmentation  strategies  for  PAH-contaminated  environments.
■590    ▼aSchool  code:  0187.
■650  4▼aMicrobiology
■650  4▼aEnvironmental  engineering
■650  4▼aGenetics
■653    ▼aGenetic  bioaugmentation
■653    ▼aConjugation
■653    ▼aPolycyclic  aromatic  hydrocarbons
■653    ▼aBioremediation
■653    ▼aDioxygenase
■690    ▼a0775
■690    ▼a0410
■690    ▼a0369
■71020▼aRice  University▼bCivil  and  Environmental  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0187
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359731▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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